code: def _get_intermediate_shape(cls, input_shape):
      if len(input_shape) > 1:
          s = input_shape[1:]
      else:
          s = (2,)
      return (np.nan,) + s
  
imports: import numpy
  from ...None import opcodes
  from ...core import OutputType
  from ...core.operand import OperandStage
  from ..utils import gen_unknown_index_value, hash_dataframe_on
  from ._duplicate import DuplicateOperand, validate_subset
label_desc: Use image node_id 7 for calling the DataFrameDuplicated obj's underlying member method code with example usage: obj._get_intermediate_shape(cls, input_shape) and returns: unknown